MdeModulePkg FaultTolerantWrite: Error handling for erase operation failure

MdeModulePkg FaultTolerantWrite: Error handling for erase operation failure

There may be anti-flash wear out feature to forbid erase operation after end of dxe.
The code is missing some error handling for erase operation failure,
it should return directly after the erase operation failed.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18320 6f19259b-4bc3-4df7-8a09-765794883524